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WOOD FRAMING RAFTER+
Roof Framing Method
Modeling Background
Rafter system modeling is based on Revit beam system objects;
Revit creates beam systems with anchored beams of predefined type;
Top faces of beams lie on the beam system work plane.
Roof Example
4 layers: interior sheeting (25mm), structure – wood rafters (150mm),
layer for battens (50mm), profiled steel covering (50mm);
Left pitch – 30 degrees, right pitch – 45 degrees.
First Step - Reduce Roof Thickness
WHY?
There is no reason to create rafter systems on top
of the roof and move them down to a good position
and layer;
When roof slopes have different pitches, the ridge
line of every layer moves to the side with a bigger
pitch;
Make Revit work for you! It calculates how much
ridge lines must move in such and more complex
roofs.
First Step - Reduce Roof Thickness
HOW?
Two ways to reduce thickness of the roof
are as follow:
1 - Delete a roof layer that lies on top of
rafters;
2 - Reduce rafter layer thickness.
NOTE: Rafter systems remember ID of the
roof. Don‘t change the type of the roof.
Otherwise problems with automatic update of
rafter systems will appear later on.
First Step - Reduce Roof Thickness
Roof thickness can be reduced
from 275mm to 25+150=175mm;
We have deleted two top layers.
Result
Next Step – Create Rafter Systems
on All Roof Slopes
Create/Update rafter systems on all roof
slopes;
Don’t create roof openings now, because
roof thickness does not meet the real
dimensions/thickness;
You can Insert/Update other roof framing
members now or later;
Don’t split rafter systems before the roof
got final framing.
Frame Next Roof Layer Now or Later
If Necessary
Add the deleted roof layer for battens
(50mm);
Create/Update batten systems on all roof
slopes;
Don’t split batten systems before the roof
got final framing.
Finishing the Roof Framing
Add the deleted top layer (50mm) of the
roof;
Insert/Update other roof framing members;
Create openings in rafter and batten
systems;
Frame openings in rafter and batten
systems.
Finishing the Roof Framing
Split rafter systems (if necessary) to align
rafters in neighbored slopes or align rafters with
wall wood studs;
Split batten systems (if necessary) to align the
first/last batten with bottom/top end of the roof
slope.
AGA CAD Ltd
T: +370 618 55671 | E: [email protected] | W: www.aga-cad.com